Android: initial support for printing

This wont work for other than PDF documents
Also, we should save the file before printing if it has been changed

2 files changed, 167 insertions, 0 deletions

diff --git a/android/src/com/artifex/mupdfdemo/MuPDFActivity.java b/android/src/com/artifex/mupdfdemo/MuPDFActivity.java
index afeedaf0..d320befd 100644
--- a/android/src/com/artifex/mupdfdemo/MuPDFActivity.java
+++ b/android/src/com/artifex/mupdfdemo/MuPDFActivity.java
@@ -75,6 +75,7 @@ public class MuPDFActivity extends Activity
 	private ImageButton mInkButton;
 	private Button mSaveInkButton;
 	private ImageButton mCancelInkButton;
+	private ImageButton mPrintButton;
 	private ViewAnimator mTopBarSwitcher;
 	private ImageButton  mLinkButton;
 	private TopBarMode   mTopBarMode;
@@ -522,6 +523,12 @@ public class MuPDFActivity extends Activity
 			}
 		});
 
+		mPrintButton.setOnClickListener(new View.OnClickListener() {
+			public void onClick(View v) {
+				printDoc();
+			}
+		});
+
 		mSaveInkButton.setOnClickListener(new View.OnClickListener() {
 			public void onClick(View v) {
 				MuPDFView pageView = (MuPDFView) mDocView.getDisplayedView();
@@ -928,6 +935,23 @@ public class MuPDFActivity extends Activity
 		mPageNumberView.setText(String.format("%d / %d", index+1, core.countPages()));
 	}
 
+	private void printDoc() {
+		Intent myIntent = getIntent();
+		Uri docUri = myIntent != null ? myIntent.getData() : null;
+
+		if (docUri == null) {
+			showInfo("Print failed");
+		}
+
+		if (docUri.getScheme() == null)
+			docUri = Uri.parse("file://"+docUri.toString());
+
+		Intent printIntent = new Intent(this, PrintDialogActivity.class);
+		printIntent.setDataAndType(docUri, "aplication/pdf");
+		printIntent.putExtra("title", mFileName);
+		startActivity(printIntent);
+	}
+
 	private void showInfo(String message) {
 		mInfoView.setText(message);
 
@@ -984,6 +1008,7 @@ public class MuPDFActivity extends Activity
 		mInkButton = (ImageButton)mButtonsView.findViewById(R.id.inkButton);
 		mSaveInkButton = (Button)mButtonsView.findViewById(R.id.saveInkButton);
 		mCancelInkButton = (ImageButton)mButtonsView.findViewById(R.id.cancelInkButton);
+		mPrintButton = (ImageButton)mButtonsView.findViewById(R.id.printButton);
 		mTopBarSwitcher = (ViewAnimator)mButtonsView.findViewById(R.id.switcher);
 		mSearchBack = (ImageButton)mButtonsView.findViewById(R.id.searchBack);
 		mSearchFwd = (ImageButton)mButtonsView.findViewById(R.id.searchForward);
diff --git a/android/src/com/artifex/mupdfdemo/PrintDialogActivity.java b/android/src/com/artifex/mupdfdemo/PrintDialogActivity.java
new file mode 100644
index 00000000..cbfe07b9
--- /dev/null
+++ b/android/src/com/artifex/mupdfdemo/PrintDialogActivity.java
@@ -0,0 +1,142 @@
+package com.artifex.mupdfdemo;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+
+import android.app.Activity;
+import android.content.ActivityNotFoundException;
+import android.content.ContentResolver;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Base64;
+import android.webkit.WebSettings;
+import android.webkit.WebView;
+import android.webkit.WebViewClient;
+
+public class PrintDialogActivity extends Activity {
+  private static final String PRINT_DIALOG_URL = "https://www.google.com/cloudprint/dialog.html";
+  private static final String JS_INTERFACE = "AndroidPrintDialog";
+  private static final String CONTENT_TRANSFER_ENCODING = "base64";
+
+  private static final String ZXING_URL = "http://zxing.appspot.com";
+  private static final int ZXING_SCAN_REQUEST = 65743;
+
+  /**
+   * Post message that is sent by Print Dialog web page when the printing dialog
+   * needs to be closed.
+   */
+  private static final String CLOSE_POST_MESSAGE_NAME = "cp-dialog-on-close";
+
+  /**
+   * Web view element to show the printing dialog in.
+   */
+  private WebView dialogWebView;
+
+  /**
+   * Intent that started the action.
+   */
+  Intent cloudPrintIntent;
+
+  @Override
+  public void onCreate(Bundle icicle) {
+    super.onCreate(icicle);
+
+    setContentView(R.layout.print_dialog);
+    dialogWebView = (WebView) findViewById(R.id.webview);
+    cloudPrintIntent = this.getIntent();
+
+    WebSettings settings = dialogWebView.getSettings();
+    settings.setJavaScriptEnabled(true);
+
+    dialogWebView.setWebViewClient(new PrintDialogWebClient());
+    dialogWebView.addJavascriptInterface(
+      new PrintDialogJavaScriptInterface(), JS_INTERFACE);
+
+    dialogWebView.loadUrl(PRINT_DIALOG_URL);
+  }
+
+  @Override
+  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
+    if (requestCode == ZXING_SCAN_REQUEST && resultCode == RESULT_OK) {
+      dialogWebView.loadUrl(intent.getStringExtra("SCAN_RESULT"));
+    }
+  }
+
+  final class PrintDialogJavaScriptInterface {
+    public String getType() {
+      return cloudPrintIntent.getType();
+    }
+
+    public String getTitle() {
+      return cloudPrintIntent.getExtras().getString("title");
+    }
+
+    public String getContent() {
+      try {
+        ContentResolver contentResolver = getContentResolver();
+        InputStream is = contentResolver.openInputStream(cloudPrintIntent.getData());
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+        byte[] buffer = new byte[4096];
+        int n = is.read(buffer);
+        while (n >= 0) {
+          baos.write(buffer, 0, n);
+          n = is.read(buffer);
+        }
+        is.close();
+        baos.flush();
+
+        return Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);
+      } catch (FileNotFoundException e) {
+        e.printStackTrace();
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+      return "";
+    }
+
+    public String getEncoding() {
+      return CONTENT_TRANSFER_ENCODING;
+    }
+
+    public void onPostMessage(String message) {
+      if (message.startsWith(CLOSE_POST_MESSAGE_NAME)) {
+        finish();
+      }
+    }
+  }
+
+  private final class PrintDialogWebClient extends WebViewClient {
+    @Override
+    public boolean shouldOverrideUrlLoading(WebView view, String url) {
+      if (url.startsWith(ZXING_URL)) {
+        Intent intentScan = new Intent("com.google.zxing.client.android.SCAN");
+        intentScan.putExtra("SCAN_MODE", "QR_CODE_MODE");
+        try {
+          startActivityForResult(intentScan, ZXING_SCAN_REQUEST);
+        } catch (ActivityNotFoundException error) {
+          view.loadUrl(url);
+        }
+      } else {
+        view.loadUrl(url);
+      }
+      return false;
+    }
+
+    @Override
+    public void onPageFinished(WebView view, String url) {
+      if (PRINT_DIALOG_URL.equals(url)) {
+        // Submit print document.
+        view.loadUrl("javascript:printDialog.setPrintDocument(printDialog.createPrintDocument("
+          + "window." + JS_INTERFACE + ".getType(),window." + JS_INTERFACE + ".getTitle(),"
+          + "window." + JS_INTERFACE + ".getContent(),window." + JS_INTERFACE + ".getEncoding()))");
+
+        // Add post messages listener.
+        view.loadUrl("javascript:window.addEventListener('message',"
+            + "function(evt){window." + JS_INTERFACE + ".onPostMessage(evt.data)}, false)");
+      }
+    }
+  }
+}